numpy in1d with two simple arrays

[scidam]

Just tried and everything works fine:

>>> import numpy as np
>>> L = np.array([ 1,  3,  5,  7, 12, 13, 14, 15, 16, 17, 18, 24, 25, 27, 29, 30, 31, 32, 33, 35, 36, 38, 41, 43])
>>> L[np.in1d(L+1, L)]
array([12, 13, 14, 15, 16, 17, 24, 29, 30, 31, 32, 35])